Showing papers on "Special relativity (alternative formulations) published in 1969"
51 citations
TL;DR: In this article, the authors discuss the properties of hypothetical systems in which group velocities exceed the speed of light and whether such systems would violate the axioms of special relativity.
Abstract: >DISCUSSION of the properties of hypothetical systems1–6 in which group velocities exceed the speed of light has considered chiefly whether such systems would violate the axioms of special relativity. In particular they appear at first sight to violate causality.
36 citations
TL;DR: In this paper, the development of Lorentz' theory of electrons is reviewed insofar as it relates to the problem of the electrodynamics of moving bodies, and it is shown that the principle of relativity did not play an important role in the theory, and that though the distinction between his own work and that of Einstein, he was unwilling to completely embrace the Einstein formulation and thereby reject the ether.
Abstract: The development of Lorentz' theory of electrons is reviewed insofar as it relates to the problem of the electrodynamics of moving bodies. It is shown that the principle of relativity did not play an important role in the Lorentz theory, and that though Lorentz eventually realized the distinctions between his own work and that of Einstein, he was unwilling to completely embrace the Einstein formulation and thereby reject the ether.
19 citations
01 Jan 1969
TL;DR: The address on Physics and Relativity in place of Nieis Bohr who was prevented from coming to Berne was given by as discussed by the authors, who described it as "a great honour".
Abstract: I have been honoured by being asked to give the address on Physics and Relativity in place of Nieis Bohr who was prevented from coming to Berne.
18 citations
16 citations
14 citations
13 citations
01 Sep 1969
TL;DR: In this paper, it is shown that a revision is needed of certain transformation equations of the Planck-Einstein formulae, where the formulaemust be replaced by where T and Q are respectively the absolute temperature and heat of the system.
Abstract: It is shown that a revision is needed of certain transformation equations of the Planck–Einstein formulae. In particular it will be shown that the formulaemust be replaced bywhere T and Q are respectively the absolute temperature and heat of the system. Furthermore, it will be shown that both formulae for the energyare correct, but they refer to different cases.
Book•
01 Jan 1969
TL;DR: In this paper, the correct application of special relativity to the case of a rotating disc is discussed, and the effects of gravitation cannot be deduced from the application of the special relativity.
TL;DR: The postulate of the constancy of the velocity of light is standard for the derivation of the theory of relativity as discussed by the authors, and it is possible to modify electromagnetism, preserving special relativity but introducing a vacuum dispersion.
Abstract: SEVERAL articles containing new evidence concerning the energy independence of the velocity of light contain statements which should be clarified. The postulate of the constancy of the velocity of light is standard for the derivation of the theory of relativity. It is possible to modify electromagnetism, preserving special relativity but introducing a vacuum dispersion; however, many experimental tests of the velocity of light as a function of energy intend to test the relativity postulate. One should therefore be careful in analysing these experiments in terms of concepts, such as those suggested by Professor Synge1, which are valid only if relativity is correct.
TL;DR: In this article, the relation between the rest mass and the potential field in all cases of scalar potentials is considered and proper attention should be given in the teaching of special relativity to the relation.
Abstract: Specialized literature deals occasionally with potentials for which the rest mass of a particle is variable. Proper attention should be given in the teaching of special relativity to the relation between the rest mass and the potential field in all cases. The case of a scalar potential is considered.
TL;DR: In this article, it was shown that at sufficiently high energies the muon energy spectrum and the zenith angle distribution of muons will be affected by the assumed violation of special relativity.
Abstract: The recent observation of Lundberg and Redei that a violation of the principles of special relativity at small distances would cause a change in the lifetime of pions and muons is submitted to a test against cosmic-ray data. It is shown that at sufficiently high energies the muon energy spectrum and the zenith angle distribution of muons will be affected by the assumed violation. Present experimental data permit us to establish an upper limit of 5·10−17 cm for the dimensions in which special relativity may not be valid.
TL;DR: In this paper, a brief survey is given of four new approaches to the teaching of special relativity, namely the so-called k calculus, methods based on the invariance of the space-time interval, the dynamical approach, and the introduction by means of thought experiments.
Abstract: A brief survey is given of four new approaches to the teaching of special relativity, namely the so-called k calculus, methods based on the invariance of the space-time interval, the dynamical approach, and the introduction by means of thought experiments Each approach has been illustrated with a few examples
TL;DR: In this paper, the affine presentation of general relativity is considered and a possible generalisation of the definition of covariant derivative is proposed, and it is shown that the only theories resulting from this generalisation are general relativity and Weyl's theory, of which general relativity arises in the most natural way.
Abstract: The affine presentation of general relativity is considered and a possible generalisation of the definition of covariant derivative is proposed. Under certain weak symmetry conditions it is shown that the only theories resulting from this generalisation are general relativity and Weyl's theory, of which general relativity arises in the most natural way.
01 Jan 1969